import type { PackageReference } from './manifest.js';
import type { ResolvedPackage } from './package-resolver.js';
export declare const runtimeEngineVersion = "1.0.0";
export declare class PackageContractError extends Error {
    readonly packageName: string;
    readonly contract: 'engine' | 'feature-api';
    constructor(packageName: string, contract: 'engine' | 'feature-api', message: string);
}
export declare function assertPackageEngine(pkg: ResolvedPackage, engineVersion?: string): void;
export declare function assertFeatureApi(owner: ResolvedPackage, reference: PackageReference, feature: ResolvedPackage): void;